Q. This year (23) first day Yom Tov Sukot is on Shabbat. To avoid eating Shalosh-seudot close to the night, since we will then be eating the Seuda of Yom Tov, we usually in similar cases, following the Rav’s advice, as on Rosh Hashana, divided the seuda after musaf into two separate meals.
We ate the first part of the meal including the cholent first. Then recited Birkat Hamazon, and went outside to the street and came back and washed Netilat Yadaim again, made hamotzi on bread, ate the dessert and that was our Shalosh Seudot.

My question is that since our suka is on the driveway at the front of our house, would just walking to the street suffice to separate the two parts of the meal and be considered as two separate seudot?

A. Horav Shlomo Miller’s Shlit’a opinion is that in any case, but specially in yours, one should go for a walk and wait a half an hour, between the two meals.

Rabbi A. Bartfeld as revised by, Horav Dovid Pam, Horav Aharon Miller, Horav Chanoch Ehrentreu and Horav Kalman Ochs Shlit’a